AT&T System 85 manual Distance Limitations, Circuit Pack Wire Will support these switches

8403 Voice Terminal

Distance Limitations

The following circuit packs can be used with all of the 8400-Series sets.

Circuit Pack	2/4-Wire	Will support these switches
TN2181 - 16-port	2-wire	G3V3, G3V2
TN754b - 8-port	4-wire	All switches except System 85
TN754 - 8-port	4-wire	All switches except System 85
TN413 - 8-port	4-wire	International System 75
SN 270 and
SN270B - 4-port	4-wire	System 85 R2V2 - R2V4

In 4-wire operation, the voice terminal must be within 5,000 feet of the PBX using 22-gauge or 24-gauge wire, and within 4,000 feet of the PBX using 26-gauge wire.

In 2-wire operation, the voice terminal must be within 5,500 feet of the PBX using 22-gauge wire, within 3,500 feet of the PBX using 24-gauge wire, and within 2,200 feet of the PBX using 26-gauge wire.

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